================
@@ -1767,12 +1805,12 @@ void MicrosoftCXXNameMangler::mangleTemplateArg(const 
TemplateDecl *TD,
       const CXXRecordDecl *RD = MPT->getMostRecentCXXRecordDecl();
       if (MPT->isMemberFunctionPointerType() &&
           !isa<FunctionTemplateDecl>(TD)) {
-        mangleMemberFunctionPointer(RD, nullptr);
+        mangleMemberFunctionPointer(RD, nullptr, nullptr, QualType());
         return;
       }
       if (MPT->isMemberDataPointer()) {
         if (!isa<FunctionTemplateDecl>(TD)) {
-          mangleMemberDataPointer(RD, nullptr);
+          mangleMemberDataPointer(RD, nullptr, nullptr, QualType());
----------------
MaxEW707 wrote:

These use cases appear to be added from, 
https://github.com/llvm/llvm-project/commit/5518a9d7673bfe55b4110bea049140316d032fbf,
 with support for C++20 nttp changes.

>From looking at the code we only hit this path when compiling for C++20 and 
>also already properly mangle according to VS2019+ by doing `$M <type>` 
>elsewhere.

I intend to take a look at C++20 NTTP after this PR and then take a more 
holistic look to see if we can better merge the C++11-17 and C++20 mangling 
paths in `MicrosoftMangle.cpp`.

https://github.com/llvm/llvm-project/pull/97007
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